Oral irrigator



FIG. 1 is a front perspective view of an oral irrigator according to the new design;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines in the drawings illustrate portions of the oral irrigator that form no part of the claimed design. 

CLAIM The ornamental design for an oral irrigator, as shown and described. 